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      <div class="body-wrap"><article id="post-es-code02" class="article article-type-post" itemscope itemprop="blogPost">
  
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      渣渣菜鸡的 ElasticSearch 源码解析 —— 启动流程（上）
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        <ul class="article-tag-list"><li class="article-tag-list-item"><a class="article-tag-list-link" href="/tags/ElasticSearch/">ElasticSearch</a></li></ul>
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<h3 id="关注我"><a href="#关注我" class="headerlink" title="关注我"></a>关注我</h3><p><img src="http://image.54tianzhisheng.cn/blog/180103/C6LG3mGa12.jpg" alt="zhisheng"></p>
<p>转载请务必注明原创地址为：<a href="http://www.54tianzhisheng.cn/2018/08/11/es-code02/">http://www.54tianzhisheng.cn/2018/08/11/es-code02/</a></p>
<h3 id="前提"><a href="#前提" class="headerlink" title="前提"></a>前提</h3><p>上篇文章写了 <a href="http://www.54tianzhisheng.cn/2018/08/05/es-code01/">ElasticSearch 源码解析 —— 环境搭建</a> ，其中里面说了启动 打开 server 模块下的 Elasticsearch 类：org.elasticsearch.bootstrap.Elasticsearch，运行里面的 main 函数就可以启动 ElasticSearch 了，这篇文章讲讲启动流程，因为篇幅会很多，所以分了两篇来写。</p>
<h3 id="启动流程"><a href="#启动流程" class="headerlink" title="启动流程"></a>启动流程</h3><h4 id="main-方法入口"><a href="#main-方法入口" class="headerlink" title="main 方法入口"></a>main 方法入口</h4><p>可以看到入口其实是一个 main 方法，方法里面先是检查权限，然后是一个错误日志监听器（确保在日志配置之前状态日志没有出现 error），然后是 Elasticsearch 对象的创建，然后调用了静态方法 main 方法（18 行），并把创建的对象和参数以及 Terminal 默认值传进去。静态的 main 方法里面调用 elasticsearch.main 方法。</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(<span class="keyword">final</span> String[] args)</span> <span class="keyword">throws</span> Exception </span>&#123;         <span class="comment">//1、入口</span></span><br><span class="line">    <span class="comment">// we want the JVM to think there is a security manager installed so that if internal policy decisions that would be based on the</span></span><br><span class="line">    <span class="comment">// presence of a security manager or lack thereof act as if there is a security manager present (e.g., DNS cache policy)</span></span><br><span class="line">    System.setSecurityManager(<span class="keyword">new</span> SecurityManager() &#123;</span><br><span class="line">        <span class="meta">@Override</span></span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">checkPermission</span><span class="params">(Permission perm)</span> </span>&#123;</span><br><span class="line">            <span class="comment">// grant all permissions so that we can later set the security manager to the one that we want</span></span><br><span class="line">        &#125;</span><br><span class="line">    &#125;);</span><br><span class="line">    LogConfigurator.registerErrorListener();                            <span class="comment">//</span></span><br><span class="line">    <span class="keyword">final</span> Elasticsearch elasticsearch = <span class="keyword">new</span> Elasticsearch();</span><br><span class="line">    <span class="keyword">int</span> status = main(args, elasticsearch, Terminal.DEFAULT); <span class="comment">//2、调用Elasticsearch.main方法</span></span><br><span class="line">    <span class="keyword">if</span> (status != ExitCodes.OK) &#123;</span><br><span class="line">        exit(status);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">int</span> <span class="title">main</span><span class="params">(<span class="keyword">final</span> String[] args, <span class="keyword">final</span> Elasticsearch elasticsearch, <span class="keyword">final</span> Terminal terminal)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">    <span class="keyword">return</span> elasticsearch.main(args, terminal);  <span class="comment">//3、command main</span></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p><img src="https://ws2.sinaimg.cn/large/006tNbRwly1fu77z6ktl2j315i0t2myl.jpg" alt="1es01"></p>
<p>因为 Elasticsearch 类是继承了 EnvironmentAwareCommand  类，EnvironmentAwareCommand  类继承了 Command 类，但是 Elasticsearch 类并没有重写 main 方法，所以上面调用的 elasticsearch.main 其实是调用了 Command 的 main 方法，代码如下：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/** Parses options for this command from args and executes it. */</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">final</span> <span class="keyword">int</span> <span class="title">main</span><span class="params">(String[] args, Terminal terminal)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">    <span class="keyword">if</span> (addShutdownHook()) &#123;                                                <span class="comment">//利用Runtime.getRuntime().addShutdownHook方法加入一个Hook，在程序退出时触发该Hook</span></span><br><span class="line">        shutdownHookThread = <span class="keyword">new</span> Thread(() -&gt; &#123;</span><br><span class="line">            <span class="keyword">try</span> &#123;</span><br><span class="line">                <span class="keyword">this</span>.close();</span><br><span class="line">            &#125; <span class="keyword">catch</span> (<span class="keyword">final</span> IOException e) &#123;</span><br><span class="line">                <span class="keyword">try</span> (</span><br><span class="line">                    StringWriter sw = <span class="keyword">new</span> StringWriter();</span><br><span class="line">                    PrintWriter pw = <span class="keyword">new</span> PrintWriter(sw)) &#123;</span><br><span class="line">                    e.printStackTrace(pw);</span><br><span class="line">                    terminal.println(sw.toString());</span><br><span class="line">                &#125; <span class="keyword">catch</span> (<span class="keyword">final</span> IOException impossible) &#123;</span><br><span class="line">                    <span class="comment">// StringWriter#close declares a checked IOException from the Closeable interface but the Javadocs for StringWriter</span></span><br><span class="line">                    <span class="comment">// say that an exception here is impossible</span></span><br><span class="line">                    <span class="keyword">throw</span> <span class="keyword">new</span> AssertionError(impossible);</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;);</span><br><span class="line">        Runtime.getRuntime().addShutdownHook(shutdownHookThread);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    beforeMain.run();</span><br><span class="line"></span><br><span class="line">    <span class="keyword">try</span> &#123;</span><br><span class="line">        mainWithoutErrorHandling(args, terminal);<span class="comment">//4、mainWithoutErrorHandling</span></span><br><span class="line">    &#125; <span class="keyword">catch</span> (OptionException e) &#123;</span><br><span class="line">        printHelp(terminal);</span><br><span class="line">        terminal.println(Terminal.Verbosity.SILENT, <span class="string">"ERROR: "</span> + e.getMessage());</span><br><span class="line">        <span class="keyword">return</span> ExitCodes.USAGE;</span><br><span class="line">    &#125; <span class="keyword">catch</span> (UserException e) &#123;</span><br><span class="line">        <span class="keyword">if</span> (e.exitCode == ExitCodes.USAGE) &#123;</span><br><span class="line">            printHelp(terminal);</span><br><span class="line">        &#125;</span><br><span class="line">        terminal.println(Terminal.Verbosity.SILENT, <span class="string">"ERROR: "</span> + e.getMessage());</span><br><span class="line">        <span class="keyword">return</span> e.exitCode;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> ExitCodes.OK;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>上面代码一开始利用一个勾子函数，在程序退出时触发该 Hook，该方法主要代码是 mainWithoutErrorHandling() 方法，然后下面的是 catch 住方法抛出的异常，方法代码如下：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/*** Executes the command, but all errors are thrown. */</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">mainWithoutErrorHandling</span><span class="params">(String[] args, Terminal terminal)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">    <span class="keyword">final</span> OptionSet options = parser.parse(args);</span><br><span class="line">    <span class="keyword">if</span> (options.has(helpOption)) &#123;</span><br><span class="line">        printHelp(terminal);</span><br><span class="line">        <span class="keyword">return</span>;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">if</span> (options.has(silentOption)) &#123;</span><br><span class="line">        terminal.setVerbosity(Terminal.Verbosity.SILENT);</span><br><span class="line">    &#125; <span class="keyword">else</span> <span class="keyword">if</span> (options.has(verboseOption)) &#123;</span><br><span class="line">        terminal.setVerbosity(Terminal.Verbosity.VERBOSE);</span><br><span class="line">    &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">        terminal.setVerbosity(Terminal.Verbosity.NORMAL);</span><br><span class="line">    &#125;</span><br><span class="line">    execute(terminal, options);<span class="comment">//5、执行 EnvironmentAwareCommand 中的 execute()，（重写了command里面抽象的execute方法）</span></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>上面的代码从 3 ～ 14 行是解析传进来的参数并配置 terminal，重要的 execute() 方法，执行的是 EnvironmentAwareCommand 中的 execute() （重写了 Command 类里面的抽象 execute 方法），从上面那个继承图可以看到 EnvironmentAwareCommand 继承了 Command，重写的 execute 方法代码如下：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Override</span></span><br><span class="line"><span class="function"><span class="keyword">protected</span> <span class="keyword">void</span> <span class="title">execute</span><span class="params">(Terminal terminal, OptionSet options)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">    <span class="keyword">final</span> Map&lt;String, String&gt; settings = <span class="keyword">new</span> HashMap&lt;&gt;();</span><br><span class="line">    <span class="keyword">for</span> (<span class="keyword">final</span> KeyValuePair kvp : settingOption.values(options)) &#123;</span><br><span class="line">        <span class="keyword">if</span> (kvp.value.isEmpty()) &#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> UserException(ExitCodes.USAGE, <span class="string">"setting ["</span> + kvp.key + <span class="string">"] must not be empty"</span>);</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">if</span> (settings.containsKey(kvp.key)) &#123;</span><br><span class="line">            <span class="keyword">final</span> String message = String.format(</span><br><span class="line">                Locale.ROOT, <span class="string">"setting [%s] already set, saw [%s] and [%s]"</span>,</span><br><span class="line">                kvp.key, settings.get(kvp.key), kvp.value);</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> UserException(ExitCodes.USAGE, message);</span><br><span class="line">        &#125;</span><br><span class="line">        settings.put(kvp.key, kvp.value);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="comment">//6、根据我们ide配置的 vm options 进行设置path.data、path.home、path.logs</span></span><br><span class="line">    putSystemPropertyIfSettingIsMissing(settings, <span class="string">"path.data"</span>, <span class="string">"es.path.data"</span>);</span><br><span class="line">    putSystemPropertyIfSettingIsMissing(settings, <span class="string">"path.home"</span>, <span class="string">"es.path.home"</span>);</span><br><span class="line">    putSystemPropertyIfSettingIsMissing(settings, <span class="string">"path.logs"</span>, <span class="string">"es.path.logs"</span>);</span><br><span class="line"></span><br><span class="line">    execute(terminal, options, createEnv(terminal, settings));<span class="comment">//7、先调用 createEnv 创建环境</span></span><br><span class="line">    <span class="comment">//9、执行elasticsearch的execute方法，elasticsearch中重写了EnvironmentAwareCommand中的抽象execute方法</span></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>方法前面是根据传参去判断配置的，如果配置为空，就会直接跳到执行 putSystemPropertyIfSettingIsMissing 方法，这里会配置三个属性：path.data、path.home、path.logs 设置 es 的 data、home、logs 目录，它这里是根据我们 ide 配置的 vm options 进行设置的，这也是为什么我们<a href="http://www.54tianzhisheng.cn/2018/08/05/es-code01/#%E7%BC%96%E8%AF%91">上篇文章</a>说的配置信息，如果不配置的话就会直接报错。下面看看 putSystemPropertyIfSettingIsMissing 方法代码里面怎么做到的：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/** Ensure the given setting exists, reading it from system properties if not already set. */</span></span><br><span class="line"><span class="function"><span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">putSystemPropertyIfSettingIsMissing</span><span class="params">(<span class="keyword">final</span> Map&lt;String, String&gt; settings, <span class="keyword">final</span> String setting, <span class="keyword">final</span> String key)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">final</span> String value = System.getProperty(key);<span class="comment">//获取key（es.path.data）找系统设置</span></span><br><span class="line">    <span class="keyword">if</span> (value != <span class="keyword">null</span>) &#123;</span><br><span class="line">        <span class="keyword">if</span> (settings.containsKey(setting)) &#123;</span><br><span class="line">            <span class="keyword">final</span> String message =</span><br><span class="line">                String.format(</span><br><span class="line">                Locale.ROOT,</span><br><span class="line">                <span class="string">"duplicate setting [%s] found via command-line [%s] and system property [%s]"</span>,</span><br><span class="line">                setting, settings.get(setting), value);</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> IllegalArgumentException(message);</span><br><span class="line">        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">            settings.put(setting, value);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>执行这三个方法后：</p>
<p><img src="https://ws2.sinaimg.cn/large/006tNbRwly1fu77z62vazj31kw0rwwty.jpg" alt="2es02"></p>
<p>跳出此方法，继续看会发现 execute 方法调用了方法，</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">execute(terminal, options, createEnv(terminal, settings));</span><br></pre></td></tr></table></figure>
<p>这里我们先看看 <code>createEnv(terminal, settings)</code> 方法：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">protected</span> Environment <span class="title">createEnv</span><span class="params">(<span class="keyword">final</span> Terminal terminal, <span class="keyword">final</span> Map&lt;String, String&gt; settings)</span> <span class="keyword">throws</span> UserException </span>&#123;</span><br><span class="line">    <span class="keyword">final</span> String esPathConf = System.getProperty(<span class="string">"es.path.conf"</span>);<span class="comment">//8、读取我们 vm options 中配置的 es.path.conf</span></span><br><span class="line">    <span class="keyword">if</span> (esPathConf == <span class="keyword">null</span>) &#123;</span><br><span class="line">        <span class="keyword">throw</span> <span class="keyword">new</span> UserException(ExitCodes.CONFIG, <span class="string">"the system property [es.path.conf] must be set"</span>);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> InternalSettingsPreparer.prepareEnvironment(Settings.EMPTY, terminal, settings, getConfigPath(esPathConf));  <span class="comment">//8、准备环境 prepareEnvironment</span></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>读取我们 ide vm options 中配置的 es.path.conf，同上篇文章也讲了这个一定要配置的，因为 es 启动的时候会加载我们的配置和一些插件。这里继续看下上面代码第 6 行的 prepareEnvironment 方法：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">static</span> Environment <span class="title">prepareEnvironment</span><span class="params">(Settings input, Terminal terminal, Map&lt;String, String&gt; properties, Path configPath)</span> </span>&#123;</span><br><span class="line">    <span class="comment">// just create enough settings to build the environment, to get the config dir</span></span><br><span class="line">    Settings.Builder output = Settings.builder();</span><br><span class="line">    initializeSettings(output, input, properties);</span><br><span class="line">    Environment environment = <span class="keyword">new</span> Environment(output.build(), configPath);</span><br><span class="line"></span><br><span class="line">    <span class="comment">//查看 es.path.conf 目录下的配置文件是不是 yml 格式的，如果不是则抛出一个异常</span></span><br><span class="line">    <span class="keyword">if</span> (Files.exists(environment.configFile().resolve(<span class="string">"elasticsearch.yaml"</span>))) &#123;</span><br><span class="line">        <span class="keyword">throw</span> <span class="keyword">new</span> SettingsException(<span class="string">"elasticsearch.yaml was deprecated in 5.5.0 and must be renamed to elasticsearch.yml"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span> (Files.exists(environment.configFile().resolve(<span class="string">"elasticsearch.json"</span>))) &#123;</span><br><span class="line">        <span class="keyword">throw</span> <span class="keyword">new</span> SettingsException(<span class="string">"elasticsearch.json was deprecated in 5.5.0 and must be converted to elasticsearch.yml"</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    output = Settings.builder(); <span class="comment">// start with a fresh output</span></span><br><span class="line">    Path path = environment.configFile().resolve(<span class="string">"elasticsearch.yml"</span>);</span><br><span class="line">    <span class="keyword">if</span> (Files.exists(path)) &#123;</span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">            output.loadFromPath(path);  <span class="comment">//加载文件并读取配置文件内容</span></span><br><span class="line">        &#125; <span class="keyword">catch</span> (IOException e) &#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> SettingsException(<span class="string">"Failed to load settings from "</span> + path.toString(), e);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">// re-initialize settings now that the config file has been loaded</span></span><br><span class="line">    initializeSettings(output, input, properties);          <span class="comment">//再一次初始化设置</span></span><br><span class="line">    finalizeSettings(output, terminal);</span><br><span class="line"></span><br><span class="line">    environment = <span class="keyword">new</span> Environment(output.build(), configPath);</span><br><span class="line"></span><br><span class="line">    <span class="comment">// we put back the path.logs so we can use it in the logging configuration file</span></span><br><span class="line">    output.put(Environment.PATH_LOGS_SETTING.getKey(), environment.logsFile().toAbsolutePath().normalize().toString());</span><br><span class="line">    <span class="keyword">return</span> <span class="keyword">new</span> Environment(output.build(), configPath);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p><img src="https://ws1.sinaimg.cn/large/006tNbRwly1fu77z80q0rj31kw0zknk0.jpg" alt="3es03"></p>
<p>准备的环境如上图，通过构建的环境查看配置文件 elasticsearch.yml 是不是以 yml 结尾，如果是 yaml 或者 json 结尾的则抛出异常（在 5.5.0 版本其他两种格式过期了，只能使用 yml 格式），然后加载该配置文件并读取里面的内容（KV结构）。</p>
<p>跳出 createEnv 方法，我们继续看 execute 方法吧。</p>
<p>EnvironmentAwareCommand 类的 execute 方法代码如下：</p>
 <figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">protected</span> <span class="keyword">abstract</span> <span class="keyword">void</span> <span class="title">execute</span><span class="params">(Terminal terminal, OptionSet options, Environment env)</span> <span class="keyword">throws</span> Exception</span>;</span><br></pre></td></tr></table></figure>
<p> 这是个抽象方法，那么它的实现方法在 Elasticsearch 类中，代码如下：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Override</span></span><br><span class="line"><span class="function"><span class="keyword">protected</span> <span class="keyword">void</span> <span class="title">execute</span><span class="params">(Terminal terminal, OptionSet options, Environment env)</span> <span class="keyword">throws</span> UserException </span>&#123;</span><br><span class="line">    <span class="keyword">if</span> (options.nonOptionArguments().isEmpty() == <span class="keyword">false</span>) &#123;</span><br><span class="line">        <span class="keyword">throw</span> <span class="keyword">new</span> UserException(ExitCodes.USAGE, <span class="string">"Positional arguments not allowed, found "</span> + options.nonOptionArguments());</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">if</span> (options.has(versionOption)) &#123;</span><br><span class="line">        <span class="keyword">final</span> String versionOutput = String.format(</span><br><span class="line">            Locale.ROOT,</span><br><span class="line">            <span class="string">"Version: %s, Build: %s/%s/%s/%s, JVM: %s"</span>,</span><br><span class="line">            Version.displayVersion(Version.CURRENT, Build.CURRENT.isSnapshot()),</span><br><span class="line">            Build.CURRENT.flavor().displayName(),</span><br><span class="line">            Build.CURRENT.type().displayName(),</span><br><span class="line">            Build.CURRENT.shortHash(),</span><br><span class="line">            Build.CURRENT.date(),</span><br><span class="line">            JvmInfo.jvmInfo().version());</span><br><span class="line">        terminal.println(versionOutput);</span><br><span class="line">        <span class="keyword">return</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">final</span> <span class="keyword">boolean</span> daemonize = options.has(daemonizeOption);</span><br><span class="line">    <span class="keyword">final</span> Path pidFile = pidfileOption.value(options);</span><br><span class="line">    <span class="keyword">final</span> <span class="keyword">boolean</span> quiet = options.has(quietOption);</span><br><span class="line"></span><br><span class="line">    <span class="comment">// a misconfigured java.io.tmpdir can cause hard-to-diagnose problems later, so reject it immediately</span></span><br><span class="line">    <span class="keyword">try</span> &#123;</span><br><span class="line">        env.validateTmpFile();</span><br><span class="line">    &#125; <span class="keyword">catch</span> (IOException e) &#123;</span><br><span class="line">        <span class="keyword">throw</span> <span class="keyword">new</span> UserException(ExitCodes.CONFIG, e.getMessage());</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">try</span> &#123;</span><br><span class="line">        init(daemonize, pidFile, quiet, env);    <span class="comment">//10、初始化</span></span><br><span class="line">    &#125; <span class="keyword">catch</span> (NodeValidationException e) &#123;</span><br><span class="line">        <span class="keyword">throw</span> <span class="keyword">new</span> UserException(ExitCodes.CONFIG, e.getMessage());</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>上面代码里主要还是看看 <code>init(daemonize, pidFile, quiet, env);</code> 初始化方法吧。</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">init</span><span class="params">(<span class="keyword">final</span> <span class="keyword">boolean</span> daemonize, <span class="keyword">final</span> Path pidFile, <span class="keyword">final</span> <span class="keyword">boolean</span> quiet, Environment initialEnv)</span></span></span><br><span class="line"><span class="function">    <span class="keyword">throws</span> NodeValidationException, UserException </span>&#123;</span><br><span class="line">    <span class="keyword">try</span> &#123;</span><br><span class="line">        Bootstrap.init(!daemonize, pidFile, quiet, initialEnv); <span class="comment">//11、执行 Bootstrap 中的 init 方法</span></span><br><span class="line">    &#125; <span class="keyword">catch</span> (BootstrapException | RuntimeException e) &#123;</span><br><span class="line">        <span class="comment">// format exceptions to the console in a special way</span></span><br><span class="line">        <span class="comment">// to avoid 2MB stacktraces from guice, etc.</span></span><br><span class="line">        <span class="keyword">throw</span> <span class="keyword">new</span> StartupException(e);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h4 id="init-方法"><a href="#init-方法" class="headerlink" title="init 方法"></a>init 方法</h4><p>Bootstrap 中的静态 init 方法如下：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">static</span> <span class="keyword">void</span> <span class="title">init</span><span class="params">(</span></span></span><br><span class="line"><span class="function"><span class="params">    <span class="keyword">final</span> <span class="keyword">boolean</span> foreground,</span></span></span><br><span class="line"><span class="function"><span class="params">    <span class="keyword">final</span> Path pidFile,</span></span></span><br><span class="line"><span class="function"><span class="params">    <span class="keyword">final</span> <span class="keyword">boolean</span> quiet,</span></span></span><br><span class="line"><span class="function"><span class="params">    <span class="keyword">final</span> Environment initialEnv)</span> <span class="keyword">throws</span> BootstrapException, NodeValidationException, UserException </span>&#123;</span><br><span class="line">    <span class="comment">// force the class initializer for BootstrapInfo to run before</span></span><br><span class="line">    <span class="comment">// the security manager is installed</span></span><br><span class="line">    BootstrapInfo.init();</span><br><span class="line"></span><br><span class="line">    INSTANCE = <span class="keyword">new</span> Bootstrap();   <span class="comment">//12、创建一个 Bootstrap 实例</span></span><br><span class="line"></span><br><span class="line">    <span class="keyword">final</span> SecureSettings keystore = loadSecureSettings(initialEnv);<span class="comment">//如果注册了安全模块则将相关配置加载进来</span></span><br><span class="line">    <span class="keyword">final</span> Environment environment = createEnvironment(foreground, pidFile, keystore, initialEnv.settings(), initialEnv.configFile());   <span class="comment">//干之前干过的事情</span></span><br><span class="line">    <span class="keyword">try</span> &#123;</span><br><span class="line">        LogConfigurator.configure(environment);   <span class="comment">//13、log 配置环境</span></span><br><span class="line">    &#125; <span class="keyword">catch</span> (IOException e) &#123;</span><br><span class="line">        <span class="keyword">throw</span> <span class="keyword">new</span> BootstrapException(e);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">if</span> (environment.pidFile() != <span class="keyword">null</span>) &#123;</span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">            PidFile.create(environment.pidFile(), <span class="keyword">true</span>);</span><br><span class="line">        &#125; <span class="keyword">catch</span> (IOException e) &#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> BootstrapException(e);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">final</span> <span class="keyword">boolean</span> closeStandardStreams = (foreground == <span class="keyword">false</span>) || quiet;</span><br><span class="line">    <span class="keyword">try</span> &#123;</span><br><span class="line">        <span class="keyword">if</span> (closeStandardStreams) &#123;</span><br><span class="line">            <span class="keyword">final</span> Logger rootLogger = ESLoggerFactory.getRootLogger();</span><br><span class="line">            <span class="keyword">final</span> Appender maybeConsoleAppender = Loggers.findAppender(rootLogger, ConsoleAppender.class);</span><br><span class="line">            <span class="keyword">if</span> (maybeConsoleAppender != <span class="keyword">null</span>) &#123;</span><br><span class="line">                Loggers.removeAppender(rootLogger, maybeConsoleAppender);</span><br><span class="line">            &#125;</span><br><span class="line">            closeSystOut();</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="comment">// fail if somebody replaced the lucene jars</span></span><br><span class="line">        checkLucene();             <span class="comment">//14、检查Lucene版本</span></span><br><span class="line"></span><br><span class="line"><span class="comment">// install the default uncaught exception handler; must be done before security is initialized as we do not want to grant the runtime permission setDefaultUncaughtExceptionHandler</span></span><br><span class="line">        Thread.setDefaultUncaughtExceptionHandler(</span><br><span class="line">            <span class="keyword">new</span> ElasticsearchUncaughtExceptionHandler(() -&gt; Node.NODE_NAME_SETTING.get(environment.settings())));</span><br><span class="line"></span><br><span class="line">        INSTANCE.setup(<span class="keyword">true</span>, environment);      <span class="comment">//15、调用 setup 方法</span></span><br><span class="line"></span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">            <span class="comment">// any secure settings must be read during node construction</span></span><br><span class="line">            IOUtils.close(keystore);</span><br><span class="line">        &#125; <span class="keyword">catch</span> (IOException e) &#123;</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> BootstrapException(e);</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        INSTANCE.start();         <span class="comment">//26、调用 start 方法</span></span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span> (closeStandardStreams) &#123;</span><br><span class="line">            closeSysError();</span><br><span class="line">        &#125;</span><br><span class="line">    &#125; <span class="keyword">catch</span> (NodeValidationException | RuntimeException e) &#123;</span><br><span class="line">        <span class="comment">// disable console logging, so user does not see the exception twice (jvm will show it already)</span></span><br><span class="line">        <span class="keyword">final</span> Logger rootLogger = ESLoggerFactory.getRootLogger();</span><br><span class="line">        <span class="keyword">final</span> Appender maybeConsoleAppender = Loggers.findAppender(rootLogger, ConsoleAppender.class);</span><br><span class="line">        <span class="keyword">if</span> (foreground &amp;&amp; maybeConsoleAppender != <span class="keyword">null</span>) &#123;</span><br><span class="line">            Loggers.removeAppender(rootLogger, maybeConsoleAppender);</span><br><span class="line">        &#125;</span><br><span class="line">        Logger logger = Loggers.getLogger(Bootstrap.class);</span><br><span class="line">        <span class="keyword">if</span> (INSTANCE.node != <span class="keyword">null</span>) &#123;</span><br><span class="line">            logger = Loggers.getLogger(Bootstrap.class, Node.NODE_NAME_SETTING.get(INSTANCE.node.settings()));</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="comment">// HACK, it sucks to do this, but we will run users out of disk space otherwise</span></span><br><span class="line">        <span class="keyword">if</span> (e <span class="keyword">instanceof</span> CreationException) &#123;</span><br><span class="line">            <span class="comment">// guice: log the shortened exc to the log file</span></span><br><span class="line">            ByteArrayOutputStream os = <span class="keyword">new</span> ByteArrayOutputStream();</span><br><span class="line">            PrintStream ps = <span class="keyword">null</span>;</span><br><span class="line">            <span class="keyword">try</span> &#123;</span><br><span class="line">                ps = <span class="keyword">new</span> PrintStream(os, <span class="keyword">false</span>, <span class="string">"UTF-8"</span>);</span><br><span class="line">            &#125; <span class="keyword">catch</span> (UnsupportedEncodingException uee) &#123;</span><br><span class="line">                <span class="keyword">assert</span> <span class="keyword">false</span>;</span><br><span class="line">                e.addSuppressed(uee);</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="keyword">new</span> StartupException(e).printStackTrace(ps);</span><br><span class="line">            ps.flush();</span><br><span class="line">            <span class="keyword">try</span> &#123;</span><br><span class="line">                logger.error(<span class="string">"Guice Exception: &#123;&#125;"</span>, os.toString(<span class="string">"UTF-8"</span>));</span><br><span class="line">            &#125; <span class="keyword">catch</span> (UnsupportedEncodingException uee) &#123;</span><br><span class="line">                <span class="keyword">assert</span> <span class="keyword">false</span>;</span><br><span class="line">                e.addSuppressed(uee);</span><br><span class="line">            &#125;</span><br><span class="line">        &#125; <span class="keyword">else</span> <span class="keyword">if</span> (e <span class="keyword">instanceof</span> NodeValidationException) &#123;</span><br><span class="line">            logger.error(<span class="string">"node validation exception\n&#123;&#125;"</span>, e.getMessage());</span><br><span class="line">        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">            <span class="comment">// full exception</span></span><br><span class="line">            logger.error(<span class="string">"Exception"</span>, e);</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="comment">// re-enable it if appropriate, so they can see any logging during the shutdown process</span></span><br><span class="line">        <span class="keyword">if</span> (foreground &amp;&amp; maybeConsoleAppender != <span class="keyword">null</span>) &#123;</span><br><span class="line">            Loggers.addAppender(rootLogger, maybeConsoleAppender);</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">throw</span> e;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>该方法主要有：</p>
<p>1、创建 Bootstrap 实例</p>
<p>2、如果注册了安全模块则将相关配置加载进来</p>
<p>3、创建 Elasticsearch 运行的必须环境以及相关配置, 如将 config、scripts、plugins、modules、logs、lib、bin 等配置目录加载到运行环境中</p>
<p>4、log 配置环境，创建日志上下文</p>
<p>5、检查是否存在 PID 文件，如果不存在，创建 PID 文件</p>
<p>6、检查 Lucene 版本</p>
<p>7、调用 setup 方法（用当前环境来创建一个节点）</p>
<h4 id="setup-方法"><a href="#setup-方法" class="headerlink" title="setup 方法"></a>setup 方法</h4><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">private</span> <span class="keyword">void</span> <span class="title">setup</span><span class="params">(<span class="keyword">boolean</span> addShutdownHook, Environment environment)</span> <span class="keyword">throws</span> BootstrapException </span>&#123;</span><br><span class="line">    Settings settings = environment.settings();<span class="comment">//根据环境得到配置</span></span><br><span class="line">    <span class="keyword">try</span> &#123;</span><br><span class="line">        spawner.spawnNativeControllers(environment);</span><br><span class="line">    &#125; <span class="keyword">catch</span> (IOException e) &#123;</span><br><span class="line">        <span class="keyword">throw</span> <span class="keyword">new</span> BootstrapException(e);</span><br><span class="line">    &#125;</span><br><span class="line">    initializeNatives(</span><br><span class="line">        environment.tmpFile(),</span><br><span class="line">        BootstrapSettings.MEMORY_LOCK_SETTING.get(settings),</span><br><span class="line">        BootstrapSettings.SYSTEM_CALL_FILTER_SETTING.get(settings),</span><br><span class="line">        BootstrapSettings.CTRLHANDLER_SETTING.get(settings));</span><br><span class="line">    <span class="comment">// initialize probes before the security manager is installed</span></span><br><span class="line">    initializeProbes();</span><br><span class="line">    <span class="keyword">if</span> (addShutdownHook) &#123;</span><br><span class="line">        Runtime.getRuntime().addShutdownHook(<span class="keyword">new</span> Thread() &#123;</span><br><span class="line">            <span class="meta">@Override</span></span><br><span class="line">            <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">()</span> </span>&#123;</span><br><span class="line">                <span class="keyword">try</span> &#123;</span><br><span class="line">                    IOUtils.close(node, spawner);</span><br><span class="line">                    LoggerContext context = (LoggerContext) LogManager.getContext(<span class="keyword">false</span>);</span><br><span class="line">                    Configurator.shutdown(context);</span><br><span class="line">                &#125; <span class="keyword">catch</span> (IOException ex) &#123;</span><br><span class="line">                    <span class="keyword">throw</span> <span class="keyword">new</span> ElasticsearchException(<span class="string">"failed to stop node"</span>, ex);</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">try</span> &#123;</span><br><span class="line">        <span class="comment">// look for jar hell</span></span><br><span class="line">        <span class="keyword">final</span> Logger logger = ESLoggerFactory.getLogger(JarHell.class);</span><br><span class="line">        JarHell.checkJarHell(logger::debug);</span><br><span class="line">    &#125; <span class="keyword">catch</span> (IOException | URISyntaxException e) &#123;</span><br><span class="line">        <span class="keyword">throw</span> <span class="keyword">new</span> BootstrapException(e);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="comment">// Log ifconfig output before SecurityManager is installed</span></span><br><span class="line">    IfConfig.logIfNecessary();</span><br><span class="line">    <span class="comment">// install SM after natives, shutdown hooks, etc.</span></span><br><span class="line">    <span class="keyword">try</span> &#123;</span><br><span class="line">        Security.configure(environment, BootstrapSettings.SECURITY_FILTER_BAD_DEFAULTS_SETTING.get(settings));</span><br><span class="line">    &#125; <span class="keyword">catch</span> (IOException | NoSuchAlgorithmException e) &#123;</span><br><span class="line">        <span class="keyword">throw</span> <span class="keyword">new</span> BootstrapException(e);</span><br><span class="line">    &#125;</span><br><span class="line">    node = <span class="keyword">new</span> Node(environment) &#123;              <span class="comment">//16、新建节点</span></span><br><span class="line">        <span class="meta">@Override</span></span><br><span class="line">        <span class="function"><span class="keyword">protected</span> <span class="keyword">void</span> <span class="title">validateNodeBeforeAcceptingRequests</span><span class="params">(</span></span></span><br><span class="line"><span class="function"><span class="params">            <span class="keyword">final</span> BootstrapContext context,</span></span></span><br><span class="line"><span class="function"><span class="params">            <span class="keyword">final</span> BoundTransportAddress boundTransportAddress, List&lt;BootstrapCheck&gt; checks)</span> <span class="keyword">throws</span> NodeValidationException </span>&#123;</span><br><span class="line">            BootstrapChecks.check(context, boundTransportAddress, checks);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>上面代码最后就是 Node 节点的创建，这篇文章就不讲 Node 的创建了，下篇文章会好好讲一下 Node 节点的创建和正式启动 ES 节点的。</p>
<h3 id="总结"><a href="#总结" class="headerlink" title="总结"></a>总结</h3><p>这篇文章主要先把大概启动流程串通，因为篇幅较多所以拆开成两篇，先不扣细节了，后面流程启动文章写完后我们再单一的扣细节。</p>
<h3 id="相关文章"><a href="#相关文章" class="headerlink" title="相关文章"></a>相关文章</h3><p>1、<a href="http://www.54tianzhisheng.cn/2018/08/04/why-see-es-code/">渣渣菜鸡为什么要看 ElasticSearch 源码？</a></p>
<p>2、<a href="http://www.54tianzhisheng.cn/2018/08/05/es-code01/">渣渣菜鸡的 ElasticSearch 源码解析 —— 环境搭建</a></p>
<p>3、<a href="http://www.54tianzhisheng.cn/2018/08/11/es-code02/">渣渣菜鸡的 ElasticSearch 源码解析 —— 启动流程(上)</a></p>
<p>4、<a href="http://www.54tianzhisheng.cn/2018/08/11/es-code03/">渣渣菜鸡的 ElasticSearch 源码解析 —— 启动流程(下)</a></p>
<p>5、<a href="http://www.54tianzhisheng.cn/2017/09/08/Elasticsearch-analyzers/">Elasticsearch 系列文章（一）：Elasticsearch 默认分词器和中分分词器之间的比较及使用方法</a></p>
<p>6、<a href="http://www.54tianzhisheng.cn/2017/09/09/Elasticsearch-install/">Elasticsearch 系列文章（二）：全文搜索引擎 Elasticsearch 集群搭建入门教程</a></p>
<p>7、<a href="http://www.54tianzhisheng.cn/2017/10/15/ElasticSearch-cluster-health-metrics/">Elasticsearch 系列文章（三）：ElasticSearch 集群监控</a></p>
<p>8、<a href="http://www.54tianzhisheng.cn/2017/10/18/ElasticSearch-nodes-metrics/">Elasticsearch 系列文章（四）：ElasticSearch 单个节点监控</a></p>
<p>9、<a href="http://www.54tianzhisheng.cn/2017/12/25/ELK/">Elasticsearch 系列文章（五）：ELK 实时日志分析平台环境搭建</a></p>
<p>10、<a href="http://www.54tianzhisheng.cn/2018/08/14/idea-remote-debug-elasticsearch/">教你如何在 IDEA 远程 Debug ElasticSearch</a></p>

      
      
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        <p><span>文章作者:</span><a href="/" title="访问 zhisheng 的个人博客">zhisheng</a></p>
        <p><span>发布时间:</span>2018年08月11日 - 00时00分</p>
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